Pop voice hosting jolly TV series
'tv series' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'pop voice hosting jolly' is the wordplay.
'pop' becomes 'dad' (synonyms).
'voice' becomes 'say' (I can't justify this - if you can you should give a lot more credence to this answer).
'hosting' is an insertion indicator.
'jolly' becomes 'rm'.
'say' enclosing 'rm' is 'sarmy'.
'dad'+'sarmy'='DADS ARMY'
Can you help me to learn more?
(Other definitions for dads army that I've seen before include "Evergreen TV comedy" , "Show" , "TV programme" , "British sitcom featuring the Home Guard" .)